I may have missed this info, but is this a one time only offer? Or will the store keep stock or have Bill make them as ordered?

It is going to be just be an initial batch we bring in when the case makes its way back here. Depending on demand we will likely bring some in on a later date, but I don't expect we will be able to do a single fan grill at a time order. We'll have some extras available but for now - after the preorders - once they are gone, they're gone for at least a good few months.